Knitting abacus



FIG. 1 is a front perspective view showing the new design.

FIG. 2 is a rear view showing the new design.

FIG. 3 is a top view showing the new design.

FIG. 4 is a bottom view showing the new design; and,

FIG. 5 is a side view showing the new design.

I claim the ornamental design for a knitting abacus, as shown anddescribed.